What is the sum of all prime numbers beetween 70 to 80? What is the product of prime numbers immediately before and after 50?

Answer both plz thx

How many $20 bills do you need to have to make $280

Which letters from the table represent like terms? a and b b and c a and d b and d

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.